#4 Microsoft's Other Business Applications Start To Erode

If the presence of the Microsoft in the corporations fades, it eventually will result in adopting Microsoft technologies on the back end like Exchange Server for email, SharePoint Server for collaboration, Lync for videoconferencing and real-time communication, and Dynamics for CRM and accounting. Exchange, SharePoint, and Dynamics all bring in more than $1 billion per year and Lync is Microsoft's fastest growing business application. And to make it worse these applications has their wings spread across a lot of other Microsoft products.

Read: 9 Things That Make Apple Products "Complicated"

#3 The Platform Business Collapses

Microsoft's fastest growing business segment for the last decade was Server & Tools, which did $7.4 billion in sales last year. A lot of revenue comes to Microsoft because its business applications like Exchange, SharePoint, and Dynamics, run on its Server and Tools. But as companies stop buying these apps, they will have less reason to buy the Microsoft platform products that run them, and the System Center products used to manage them, that all sums up into a judgment day for Microsoft.